Problem with Qiagen EpiTect Bisulfite Kit

Hi!
I am using Qiagen EpiTect Bisulfite Kit for detect methylation status.
I isolated DNA, quantified it, and I did PCR assay.
I have only amplification in PCR with primers for DNA methylated.
I have not amplification in PCR with primers for DNA no methylated.
I think the problem is in bisulfite treatment.
Please!!!
Help!!!
Where is the problem???